Re: [PATCH v2] iio: add driver for Microchip MCP413X/414X/415X/416X/423X/424X/425X/426X
From: Peter Meerwald-Stadler
Date: Sat Mar 19 2016 - 09:58:58 EST
> The following functionalities are supported:
> - write, read from volatile memory
>
> Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22060b.pdf
comments below
> Signed-off-by: Slawomir Stepien <sst@xxxxxxxxx>
> ---
> This is v2 of patch: "iio: add driver for Microchip MCP414X/416X/424X/426X"
>
> Changes since v1:
> - One line summary changed
> - Fixed module name and OF compatible
> - Based code on Peter Rosin's code from mcp4531.c
> - No additional sysfs attributes
> - Deleted not used devid struct memeber
> - Changed mcp4131_exec function arguments:
> - write value is now u16
> - no need to pass return buffer array - rx array from mcp4131_data is used
> - Added missing new line characters to dev_info
> ---
> .../bindings/iio/potentiometer/mcp4131.txt | 84 ++++
> drivers/iio/potentiometer/Kconfig | 18 +
> drivers/iio/potentiometer/Makefile | 1 +
> drivers/iio/potentiometer/mcp4131.c | 523 +++++++++++++++++++++
> 4 files changed, 626 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/iio/potentiometer/mcp4131.txt
> create mode 100644 drivers/iio/potentiometer/mcp4131.c
>
> diff --git a/Documentation/devicetree/bindings/iio/potentiometer/mcp4131.txt b/Documentation/devicetree/bindings/iio/potentiometer/mcp4131.txt
> new file mode 100644
> index 0000000..3ccba16
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/potentiometer/mcp4131.txt
> @@ -0,0 +1,84 @@
> +* Microchip MCP413X/414X/415X/416X/423X/424X/425X/426X Digital Potentiometer
> + driver
> +
> +The node for this driver must be a child node of a SPI controller, hence
> +all mandatory properties described in
> +
> + Documentation/devicetree/bindings/spi/spi-bus.txt
> +
> +must be specified.
> +
> +Required properties:
> + - compatible: Must be one of the following, depending on the
> + model:
> + "microchip,mcp4131-502"
> + "microchip,mcp4131-103"
> + "microchip,mcp4131-503"
> + "microchip,mcp4131-104"
> + "microchip,mcp4132-502"
> + "microchip,mcp4132-103"
> + "microchip,mcp4132-503"
> + "microchip,mcp4132-104"
> + "microchip,mcp4141-502"
> + "microchip,mcp4141-103"
> + "microchip,mcp4141-503"
> + "microchip,mcp4141-104"
> + "microchip,mcp4142-502"
> + "microchip,mcp4142-103"
> + "microchip,mcp4142-503"
> + "microchip,mcp4142-104"
> + "microchip,mcp4151-502"
> + "microchip,mcp4151-103"
> + "microchip,mcp4151-503"
> + "microchip,mcp4151-104"
> + "microchip,mcp4152-502"
> + "microchip,mcp4152-103"
> + "microchip,mcp4152-503"
> + "microchip,mcp4152-104"
> + "microchip,mcp4161-502"
> + "microchip,mcp4161-103"
> + "microchip,mcp4161-503"
> + "microchip,mcp4161-104"
> + "microchip,mcp4162-502"
> + "microchip,mcp4162-103"
> + "microchip,mcp4162-503"
> + "microchip,mcp4162-104"
> + "microchip,mcp4231-502"
> + "microchip,mcp4231-103"
> + "microchip,mcp4231-503"
> + "microchip,mcp4231-104"
> + "microchip,mcp4232-502"
> + "microchip,mcp4232-103"
> + "microchip,mcp4232-503"
> + "microchip,mcp4232-104"
> + "microchip,mcp4241-502"
> + "microchip,mcp4241-103"
> + "microchip,mcp4241-503"
> + "microchip,mcp4241-104"
> + "microchip,mcp4242-502"
> + "microchip,mcp4242-103"
> + "microchip,mcp4242-503"
> + "microchip,mcp4242-104"
> + "microchip,mcp4251-502"
> + "microchip,mcp4251-103"
> + "microchip,mcp4251-503"
> + "microchip,mcp4251-104"
> + "microchip,mcp4252-502"
> + "microchip,mcp4252-103"
> + "microchip,mcp4252-503"
> + "microchip,mcp4252-104"
> + "microchip,mcp4261-502"
> + "microchip,mcp4261-103"
> + "microchip,mcp4261-503"
> + "microchip,mcp4261-104"
> + "microchip,mcp4262-502"
> + "microchip,mcp4262-103"
> + "microchip,mcp4262-503"
> + "microchip,mcp4262-104"
> +
> +Example:
> +mcp4131: mcp4131@0 {
> + compatible = "mcp4131-502";
> + reg = <0>;
> + spi-max-frequency = <500000>;
> +};
> diff --git a/drivers/iio/potentiometer/Kconfig b/drivers/iio/potentiometer/Kconfig
> index fd75db7..5ef181a 100644
> --- a/drivers/iio/potentiometer/Kconfig
> +++ b/drivers/iio/potentiometer/Kconfig
> @@ -5,6 +5,24 @@
>
> menu "Digital potentiometers"
>
> +config MCP4131
> + tristate "Microchip MCP413X/414X/415X/416X/423X/424X/425X/426X Digital Potentiometer driver"
> + depends on SPI
> + help
> + Say yes here to build support for the Microchip
> + MCP4131, MCP4132,
> + MCP4141, MCP4142,
> + MCP4151, MCP4152,
> + MCP4161, MCP4162,
> + MCP4231, MCP4232,
> + MCP4241, MCP4242,
> + MCP4251, MCP4252,
> + MCP4261, MCP4262,
> + digital potentiomenter chips.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called mcp4131.
> +
> config MCP4531
> tristate "Microchip MCP45xx/MCP46xx Digital Potentiometer driver"
> depends on I2C
> diff --git a/drivers/iio/potentiometer/Makefile b/drivers/iio/potentiometer/Makefile
> index 8afe492..cd5c80b 100644
> --- a/drivers/iio/potentiometer/Makefile
> +++ b/drivers/iio/potentiometer/Makefile
> @@ -3,4 +3,5 @@
> #
>
> # When adding new entries keep the list in alphabetical order
> +obj-$(CONFIG_MCP4131) += mcp4131.o
> obj-$(CONFIG_MCP4531) += mcp4531.o
> diff --git a/drivers/iio/potentiometer/mcp4131.c b/drivers/iio/potentiometer/mcp4131.c
> new file mode 100644
> index 0000000..3553c9e
> --- /dev/null
> +++ b/drivers/iio/potentiometer/mcp4131.c
> @@ -0,0 +1,523 @@
> +/*
> + * Industrial I/O driver for Microchip digital potentiometers
> + *
> + * Copyright (c) 2016 Slawomir Stepien
> + * Based on: Peter Rosin's code from mcp4531.c
> + *
> + * Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22060b.pdf
> + *
> + * DEVID #Wipers #Positions Resistor Opts (kOhm)
> + * mcp4131 1 129 5, 10, 50, 100
> + * mcp4132 1 129 5, 10, 50, 100
> + * mcp4141 1 129 5, 10, 50, 100
> + * mcp4142 1 129 5, 10, 50, 100
> + * mcp4151 1 257 5, 10, 50, 100
> + * mcp4152 1 257 5, 10, 50, 100
> + * mcp4161 1 257 5, 10, 50, 100
> + * mcp4162 1 257 5, 10, 50, 100
> + * mcp4231 2 129 5, 10, 50, 100
> + * mcp4232 2 129 5, 10, 50, 100
> + * mcp4241 2 129 5, 10, 50, 100
> + * mcp4242 2 129 5, 10, 50, 100
> + * mcp4251 2 257 5, 10, 50, 100
> + * mcp4252 2 257 5, 10, 50, 100
> + * mcp4261 2 257 5, 10, 50, 100
> + * mcp4262 2 257 5, 10, 50, 100
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + */
> +
> +/*
> + * TODO:
> + * 1. Write wiper setting to EEPROM for EEPROM capable models.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/spi/spi.h>
> +#include <linux/err.h>
> +
> +#include <linux/iio/iio.h>
> +
> +#define MCP4131_WRITE (0x00 << 2)
> +#define MCP4131_READ (0x03 << 2)
> +
> +#define MCP4131_WIPER_SHIFT (4)
() not needed
> +#define MCP4131_CMDERR(r) ((r[0]) & 0x02)
> +#define MCP4131_RAW(r) ((r[0]) == 0xff ? 0x100 : (r[1]))
> +
> +struct mcp4131_cfg {
> + int wipers;
> + int max_pos;
> + int kohms;
> +};
> +
> +enum mcp4131_type {
> + MCP413x_502 = 0,
> + MCP413x_103,
> + MCP413x_503,
> + MCP413x_104,
> + MCP414x_502,
> + MCP414x_103,
> + MCP414x_503,
> + MCP414x_104,
> + MCP415x_502,
> + MCP415x_103,
> + MCP415x_503,
> + MCP415x_104,
> + MCP416x_502,
> + MCP416x_103,
> + MCP416x_503,
> + MCP416x_104,
> + MCP423x_502,
> + MCP423x_103,
> + MCP423x_503,
> + MCP423x_104,
> + MCP424x_502,
> + MCP424x_103,
> + MCP424x_503,
> + MCP424x_104,
> + MCP425x_502,
> + MCP425x_103,
> + MCP425x_503,
> + MCP425x_104,
> + MCP426x_502,
> + MCP426x_103,
> + MCP426x_503,
> + MCP426x_104,
> +};
> +
> +static const struct mcp4131_cfg mcp4131_cfg[] = {
> + [MCP413x_502] = { .wipers = 1, .max_pos = 128, .kohms = 5, },
> + [MCP413x_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
> + [MCP413x_503] = { .wipers = 1, .max_pos = 128, .kohms = 50, },
> + [MCP413x_104] = { .wipers = 1, .max_pos = 128, .kohms = 100, },
> + [MCP414x_502] = { .wipers = 1, .max_pos = 128, .kohms = 5, },
> + [MCP414x_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
> + [MCP414x_503] = { .wipers = 1, .max_pos = 128, .kohms = 50, },
> + [MCP414x_104] = { .wipers = 1, .max_pos = 128, .kohms = 100, },
> + [MCP415x_502] = { .wipers = 1, .max_pos = 256, .kohms = 5, },
> + [MCP415x_103] = { .wipers = 1, .max_pos = 256, .kohms = 10, },
> + [MCP415x_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
> + [MCP415x_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
> + [MCP416x_502] = { .wipers = 1, .max_pos = 256, .kohms = 5, },
> + [MCP416x_103] = { .wipers = 1, .max_pos = 256, .kohms = 10, },
> + [MCP416x_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
> + [MCP416x_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
> + [MCP423x_502] = { .wipers = 2, .max_pos = 128, .kohms = 5, },
> + [MCP423x_103] = { .wipers = 2, .max_pos = 128, .kohms = 10, },
> + [MCP423x_503] = { .wipers = 2, .max_pos = 128, .kohms = 50, },
> + [MCP423x_104] = { .wipers = 2, .max_pos = 128, .kohms = 100, },
> + [MCP424x_502] = { .wipers = 2, .max_pos = 128, .kohms = 5, },
> + [MCP424x_103] = { .wipers = 2, .max_pos = 128, .kohms = 10, },
> + [MCP424x_503] = { .wipers = 2, .max_pos = 128, .kohms = 50, },
> + [MCP424x_104] = { .wipers = 2, .max_pos = 128, .kohms = 100, },
> + [MCP425x_502] = { .wipers = 2, .max_pos = 256, .kohms = 5, },
> + [MCP425x_103] = { .wipers = 2, .max_pos = 256, .kohms = 10, },
> + [MCP425x_503] = { .wipers = 2, .max_pos = 256, .kohms = 50, },
> + [MCP425x_104] = { .wipers = 2, .max_pos = 256, .kohms = 100, },
> + [MCP426x_502] = { .wipers = 2, .max_pos = 256, .kohms = 5, },
> + [MCP426x_103] = { .wipers = 2, .max_pos = 256, .kohms = 10, },
> + [MCP426x_503] = { .wipers = 2, .max_pos = 256, .kohms = 50, },
> + [MCP426x_104] = { .wipers = 2, .max_pos = 256, .kohms = 100, },
> +};
> +
> +struct mcp4131_data {
> + struct spi_device *spi;
> + unsigned long devid;
> + struct mutex lock;
> + u8 tx[2], rx[2];
alignment requirements for SPI transfer?
> + struct spi_transfer xfer;
> + struct spi_message msg;
> +};
> +
> +#define MCP4131_CHANNEL(ch) { \
> + .type = IIO_RESISTANCE, \
> + .indexed = 1, \
> + .output = 1, \
> + .channel = (ch), \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
> +}
> +
> +static const struct iio_chan_spec mcp4131_channels[] = {
> + MCP4131_CHANNEL(0),
> + MCP4131_CHANNEL(1),
> +};
> +
> +static int mcp4131_exec(struct mcp4131_data *data,
> + u8 addr, u8 cmd,
> + u16 val)
> +{
> + int err;
> + struct spi_device *spi = data->spi;
> +
> + data->rx[0] = 0;
> + data->rx[1] = 0;
initialization needed?
setup of data->xfer + data->tx is done outside the lock, this seems wrong
> +
> + switch (cmd) {
> + case MCP4131_READ:
> + data->xfer.len = 2; /* Two bytes transfer for this command */
> + data->tx[0] = (addr << MCP4131_WIPER_SHIFT) | MCP4131_READ;
> + data->tx[1] = 0;
> + break;
> +
> + case MCP4131_WRITE:
> + data->xfer.len = 2;
> + data->tx[0] = (addr << MCP4131_WIPER_SHIFT) |
> + MCP4131_WRITE | (val >> 8);
> + data->tx[1] = val & 0xFF; /* 8 bits here */
> + break;
> +
> + default:
> + return -EINVAL;
> + }
> +
> + dev_dbg(&spi->dev, "mcp4131_exec: tx0: 0x%x tx1: 0x%x\n",
> + data->tx[0], data->tx[1]);
> +
> + mutex_lock(&data->lock);
> + spi_message_init(&data->msg);
> + spi_message_add_tail(&data->xfer, &data->msg);
> +
> + err = spi_sync(spi, &data->msg);
> + if (err) {
> + dev_err(&spi->dev, "spi_sync(): %d\n", err);
> + mutex_unlock(&data->lock);
> + return err;
> + }
> + mutex_unlock(&data->lock);
> +
> + dev_dbg(&spi->dev, "mcp4131_exec: rx0: 0x%x rx1: 0x%x\n",
> + data->rx[0], data->rx[1]);
> +
> + return 0;
> +}
> +
> +static int mcp4131_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + int err;
> + struct mcp4131_data *data = iio_priv(indio_dev);
> + int address = chan->channel;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + err = mcp4131_exec(data, address, MCP4131_READ, 0);
> + if (err)
> + return err;
> +
> + /* Error, bad address/command combination */
> + if (!MCP4131_CMDERR(data->rx))
> + return -EIO;
> +
> + *val = MCP4131_RAW(data->rx);
> + return IIO_VAL_INT;
> +
> + case IIO_CHAN_INFO_SCALE:
> + *val = 1000 * mcp4131_cfg[data->devid].kohms;
> + *val2 = mcp4131_cfg[data->devid].max_pos;
> + return IIO_VAL_FRACTIONAL;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int mcp4131_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + struct mcp4131_data *data = iio_priv(indio_dev);
> + int address = chan->channel << MCP4131_WIPER_SHIFT;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + if (val > mcp4131_cfg[data->devid].max_pos || val < 0)
> + return -EINVAL;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return mcp4131_exec(data, address, MCP4131_WRITE, val);
> +}
> +
> +static const struct iio_info mcp4131_info = {
> + .read_raw = mcp4131_read_raw,
> + .write_raw = mcp4131_write_raw,
> + .driver_module = THIS_MODULE,
> +};
> +
> +static int mcp4131_probe(struct spi_device *spi)
> +{
> + int err;
> + struct device *dev = &spi->dev;
> + unsigned long devid = spi_get_device_id(spi)->driver_data;
> + struct mcp4131_data *data;
> + struct iio_dev *indio_dev;
> +
> + indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + data = iio_priv(indio_dev);
> + spi_set_drvdata(spi, indio_dev);
> + data->spi = spi;
> + data->devid = devid;
> +
> + data->xfer.tx_buf = data->tx;
> + data->xfer.rx_buf = data->rx;
> +
> + mutex_init(&data->lock);
> +
> + indio_dev->dev.parent = dev;
> + indio_dev->info = &mcp4131_info;
> + indio_dev->channels = mcp4131_channels;
> + indio_dev->num_channels = mcp4131_cfg[devid].wipers;
> + indio_dev->name = spi_get_device_id(spi)->name;
> +
> + err = devm_iio_device_register(dev, indio_dev);
> + if (err) {
> + dev_info(&spi->dev, "Unable to register %s\n", indio_dev->name);
> + return err;
> + }
> +
> + dev_info(&spi->dev, "Registered %s\n", indio_dev->name);
I'd rather drop this message
> +
> + return 0;
> +}
> +
> +static int mcp4131_remove(struct spi_device *spi)
> +{
> + struct iio_dev *indio_dev = spi_get_drvdata(spi);
> + struct mcp4131_data *data = iio_priv(indio_dev);
> +
> + mutex_destroy(&data->lock);
no need to call
> + devm_iio_device_unregister(&spi->dev, indio_dev);
don't call this explicitly, it is done automatically after _remove
> +
> + dev_info(&spi->dev, "Unregistered %s\n", indio_dev->name);
don't
I think the entire _remove can be removed
> +
> + return 0;
> +}
> +
> +#if defined(CONFIG_OF)
> +static const struct of_device_id mcp4131_dt_ids[] = {
> + { .compatible = "microchip,mcp4131-502",
> + .data = &mcp4131_cfg[MCP413x_502] },
> + { .compatible = "microchip,mcp4131-103",
> + .data = &mcp4131_cfg[MCP413x_103] },
> + { .compatible = "microchip,mcp4131-503",
> + .data = &mcp4131_cfg[MCP413x_503] },
> + { .compatible = "microchip,mcp4131-104",
> + .data = &mcp4131_cfg[MCP413x_104] },
> + { .compatible = "microchip,mcp4132-502",
> + .data = &mcp4131_cfg[MCP413x_502] },
> + { .compatible = "microchip,mcp4132-103",
> + .data = &mcp4131_cfg[MCP413x_103] },
> + { .compatible = "microchip,mcp4132-503",
> + .data = &mcp4131_cfg[MCP413x_503] },
> + { .compatible = "microchip,mcp4132-104",
> + .data = &mcp4131_cfg[MCP413x_104] },
> + { .compatible = "microchip,mcp4141-502",
> + .data = &mcp4131_cfg[MCP414x_502] },
> + { .compatible = "microchip,mcp4141-103",
> + .data = &mcp4131_cfg[MCP414x_103] },
> + { .compatible = "microchip,mcp4141-503",
> + .data = &mcp4131_cfg[MCP414x_503] },
> + { .compatible = "microchip,mcp4141-104",
> + .data = &mcp4131_cfg[MCP414x_104] },
> + { .compatible = "microchip,mcp4142-502",
> + .data = &mcp4131_cfg[MCP414x_502] },
> + { .compatible = "microchip,mcp4142-103",
> + .data = &mcp4131_cfg[MCP414x_103] },
> + { .compatible = "microchip,mcp4142-503",
> + .data = &mcp4131_cfg[MCP414x_503] },
> + { .compatible = "microchip,mcp4142-104",
> + .data = &mcp4131_cfg[MCP414x_104] },
> + { .compatible = "microchip,mcp4151-502",
> + .data = &mcp4131_cfg[MCP415x_502] },
> + { .compatible = "microchip,mcp4151-103",
> + .data = &mcp4131_cfg[MCP415x_103] },
> + { .compatible = "microchip,mcp4151-503",
> + .data = &mcp4131_cfg[MCP415x_503] },
> + { .compatible = "microchip,mcp4151-104",
> + .data = &mcp4131_cfg[MCP415x_104] },
> + { .compatible = "microchip,mcp4152-502",
> + .data = &mcp4131_cfg[MCP415x_502] },
> + { .compatible = "microchip,mcp4152-103",
> + .data = &mcp4131_cfg[MCP415x_103] },
> + { .compatible = "microchip,mcp4152-503",
> + .data = &mcp4131_cfg[MCP415x_503] },
> + { .compatible = "microchip,mcp4152-104",
> + .data = &mcp4131_cfg[MCP415x_104] },
> + { .compatible = "microchip,mcp4161-502",
> + .data = &mcp4131_cfg[MCP416x_502] },
> + { .compatible = "microchip,mcp4161-103",
> + .data = &mcp4131_cfg[MCP416x_103] },
> + { .compatible = "microchip,mcp4161-503",
> + .data = &mcp4131_cfg[MCP416x_503] },
> + { .compatible = "microchip,mcp4161-104",
> + .data = &mcp4131_cfg[MCP416x_104] },
> + { .compatible = "microchip,mcp4162-502",
> + .data = &mcp4131_cfg[MCP416x_502] },
> + { .compatible = "microchip,mcp4162-103",
> + .data = &mcp4131_cfg[MCP416x_103] },
> + { .compatible = "microchip,mcp4162-503",
> + .data = &mcp4131_cfg[MCP416x_503] },
> + { .compatible = "microchip,mcp4162-104",
> + .data = &mcp4131_cfg[MCP416x_104] },
> + { .compatible = "microchip,mcp4231-502",
> + .data = &mcp4131_cfg[MCP423x_502] },
> + { .compatible = "microchip,mcp4231-103",
> + .data = &mcp4131_cfg[MCP423x_103] },
> + { .compatible = "microchip,mcp4231-503",
> + .data = &mcp4131_cfg[MCP423x_503] },
> + { .compatible = "microchip,mcp4231-104",
> + .data = &mcp4131_cfg[MCP423x_104] },
> + { .compatible = "microchip,mcp4232-502",
> + .data = &mcp4131_cfg[MCP423x_502] },
> + { .compatible = "microchip,mcp4232-103",
> + .data = &mcp4131_cfg[MCP423x_103] },
> + { .compatible = "microchip,mcp4232-503",
> + .data = &mcp4131_cfg[MCP423x_503] },
> + { .compatible = "microchip,mcp4232-104",
> + .data = &mcp4131_cfg[MCP423x_104] },
> + { .compatible = "microchip,mcp4241-502",
> + .data = &mcp4131_cfg[MCP424x_502] },
> + { .compatible = "microchip,mcp4241-103",
> + .data = &mcp4131_cfg[MCP424x_103] },
> + { .compatible = "microchip,mcp4241-503",
> + .data = &mcp4131_cfg[MCP424x_503] },
> + { .compatible = "microchip,mcp4241-104",
> + .data = &mcp4131_cfg[MCP424x_104] },
> + { .compatible = "microchip,mcp4242-502",
> + .data = &mcp4131_cfg[MCP424x_502] },
> + { .compatible = "microchip,mcp4242-103",
> + .data = &mcp4131_cfg[MCP424x_103] },
> + { .compatible = "microchip,mcp4242-503",
> + .data = &mcp4131_cfg[MCP424x_503] },
> + { .compatible = "microchip,mcp4242-104",
> + .data = &mcp4131_cfg[MCP424x_104] },
> + { .compatible = "microchip,mcp4251-502",
> + .data = &mcp4131_cfg[MCP425x_502] },
> + { .compatible = "microchip,mcp4251-103",
> + .data = &mcp4131_cfg[MCP425x_103] },
> + { .compatible = "microchip,mcp4251-503",
> + .data = &mcp4131_cfg[MCP425x_503] },
> + { .compatible = "microchip,mcp4251-104",
> + .data = &mcp4131_cfg[MCP425x_104] },
> + { .compatible = "microchip,mcp4252-502",
> + .data = &mcp4131_cfg[MCP425x_502] },
> + { .compatible = "microchip,mcp4252-103",
> + .data = &mcp4131_cfg[MCP425x_103] },
> + { .compatible = "microchip,mcp4252-503",
> + .data = &mcp4131_cfg[MCP425x_503] },
> + { .compatible = "microchip,mcp4252-104",
> + .data = &mcp4131_cfg[MCP425x_104] },
> + { .compatible = "microchip,mcp4261-502",
> + .data = &mcp4131_cfg[MCP426x_502] },
> + { .compatible = "microchip,mcp4261-103",
> + .data = &mcp4131_cfg[MCP426x_103] },
> + { .compatible = "microchip,mcp4261-503",
> + .data = &mcp4131_cfg[MCP426x_503] },
> + { .compatible = "microchip,mcp4261-104",
> + .data = &mcp4131_cfg[MCP426x_104] },
> + { .compatible = "microchip,mcp4262-502",
> + .data = &mcp4131_cfg[MCP426x_502] },
> + { .compatible = "microchip,mcp4262-103",
> + .data = &mcp4131_cfg[MCP426x_103] },
> + { .compatible = "microchip,mcp4262-503",
> + .data = &mcp4131_cfg[MCP426x_503] },
> + { .compatible = "microchip,mcp4262-104",
> + .data = &mcp4131_cfg[MCP426x_104] },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, mcp4131_dt_ids);
> +#endif /* CONFIG_OF */
> +
> +static const struct spi_device_id mcp4131_id[] = {
> + { "mcp4131-502", MCP413x_502 },
> + { "mcp4131-103", MCP413x_103 },
> + { "mcp4131-503", MCP413x_503 },
> + { "mcp4131-104", MCP413x_104 },
> + { "mcp4132-502", MCP413x_502 },
> + { "mcp4132-103", MCP413x_103 },
> + { "mcp4132-503", MCP413x_503 },
> + { "mcp4132-104", MCP413x_104 },
> + { "mcp4141-502", MCP414x_502 },
> + { "mcp4141-103", MCP414x_103 },
> + { "mcp4141-503", MCP414x_503 },
> + { "mcp4141-104", MCP414x_104 },
> + { "mcp4142-502", MCP414x_502 },
> + { "mcp4142-103", MCP414x_103 },
> + { "mcp4142-503", MCP414x_503 },
> + { "mcp4142-104", MCP414x_104 },
> + { "mcp4151-502", MCP415x_502 },
> + { "mcp4151-103", MCP415x_103 },
> + { "mcp4151-503", MCP415x_503 },
> + { "mcp4151-104", MCP415x_104 },
> + { "mcp4152-502", MCP415x_502 },
> + { "mcp4152-103", MCP415x_103 },
> + { "mcp4152-503", MCP415x_503 },
> + { "mcp4152-104", MCP415x_104 },
> + { "mcp4161-502", MCP416x_502 },
> + { "mcp4161-103", MCP416x_103 },
> + { "mcp4161-503", MCP416x_503 },
> + { "mcp4161-104", MCP416x_104 },
> + { "mcp4162-502", MCP416x_502 },
> + { "mcp4162-103", MCP416x_103 },
> + { "mcp4162-503", MCP416x_503 },
> + { "mcp4162-104", MCP416x_104 },
> + { "mcp4231-502", MCP423x_502 },
> + { "mcp4231-103", MCP423x_103 },
> + { "mcp4231-503", MCP423x_503 },
> + { "mcp4231-104", MCP423x_104 },
> + { "mcp4232-502", MCP423x_502 },
> + { "mcp4232-103", MCP423x_103 },
> + { "mcp4232-503", MCP423x_503 },
> + { "mcp4232-104", MCP423x_104 },
> + { "mcp4241-502", MCP424x_502 },
> + { "mcp4241-103", MCP424x_103 },
> + { "mcp4241-503", MCP424x_503 },
> + { "mcp4241-104", MCP424x_104 },
> + { "mcp4242-502", MCP424x_502 },
> + { "mcp4242-103", MCP424x_103 },
> + { "mcp4242-503", MCP424x_503 },
> + { "mcp4242-104", MCP424x_104 },
> + { "mcp4251-502", MCP425x_502 },
> + { "mcp4251-103", MCP425x_103 },
> + { "mcp4251-503", MCP425x_503 },
> + { "mcp4251-104", MCP425x_104 },
> + { "mcp4252-502", MCP425x_502 },
> + { "mcp4252-103", MCP425x_103 },
> + { "mcp4252-503", MCP425x_503 },
> + { "mcp4252-104", MCP425x_104 },
> + { "mcp4261-502", MCP426x_502 },
> + { "mcp4261-103", MCP426x_103 },
> + { "mcp4261-503", MCP426x_503 },
> + { "mcp4261-104", MCP426x_104 },
> + { "mcp4262-502", MCP426x_502 },
> + { "mcp4262-103", MCP426x_103 },
> + { "mcp4262-503", MCP426x_503 },
> + { "mcp4262-104", MCP426x_104 },
> + {}
> +};
> +MODULE_DEVICE_TABLE(spi, mcp4131_id);
> +
> +static struct spi_driver mcp4131_driver = {
> + .driver = {
> + .name = "mcp4131",
> + .of_match_table = of_match_ptr(mcp4131_dt_ids),
> + },
> + .probe = mcp4131_probe,
> + .remove = mcp4131_remove,
> + .id_table = mcp4131_id,
> +};
> +
> +module_spi_driver(mcp4131_driver);
> +
> +MODULE_AUTHOR("Slawomir Stepien <sst@xxxxxxxxx>");
> +MODULE_DESCRIPTION("MCP4131 digital potentiometer");
> +MODULE_LICENSE("GPL v2");
>
--
Peter Meerwald-Stadler
+43-664-2444418 (mobile)